The concept of knowledge worker has been around for fifty years and many
information and communication technologies have been implemented in order to support this type of work. Workplaces have changed substantially, but information is scarce about how
actual knowledge workers handle knowledge in their workplaces. This paper presents the results of a joint study of knowledge workers’ workplaces in five organisations representing a diverse sample in terms of size, sector and technology intensity. The results suggest that a
number of person types with predominant ways of handling knowledge can be favourably used for designing supportive tools and infrastructures.